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Aromatization Catalyst Preparation with Alkali Metal Present During a Washing Step

a technology of aromatization catalyst and alkali metal, which is applied in the direction of physical/chemical process catalyst, bulk chemical production, hydrocarbon oil treatment product, etc., can solve the problem of not being able to perform an ion exchange process, and achieve the effect of reducing catalyst micropore volume, reducing catalyst surface area, and increasing product selectivity

Active Publication Date: 2018-06-21
CHEVRON PHILLIPS CHEMICAL CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patent describes methods for producing supported catalysts that can be used to convert non-aromatic hydrocarbons into aromatic compounds, such as benzene and toluene. The method involves washing a zeolite base with an aqueous solution containing an alkali metal to create an enriched zeolite support, and then impregnating this support with a transition metal and a halogen to produce the final catalyst. These methods result in catalysts with increased product selectivity but reduced surface area and micropore volume compared to other methods.

Problems solved by technology

It may not be desirable to perform an ion-exchange process after the formation of the bound zeolite base, due in part to the additional cost and complexity that it would add to the overall manufacturing process of the catalyst.

Method used

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  • Aromatization Catalyst Preparation with Alkali Metal Present During a Washing Step
  • Aromatization Catalyst Preparation with Alkali Metal Present During a Washing Step
  • Aromatization Catalyst Preparation with Alkali Metal Present During a Washing Step

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examples

[0092]The invention is further illustrated by the following examples, which are not to be construed in any way as imposing limitations to the scope of this invention. Various other aspects, modifications, and equivalents thereof which, after reading the description herein, may suggest themselves to one of ordinary skill in the art without departing from the spirit of the present invention or the scope of the appended claims.

[0093]Supported catalysts were tested for their performance in aromatization reactions using the following general procedure. The supported aromatization catalysts were ground and sieved to about 25-45 mesh, and 1 cc of the sieved catalyst was placed in a ⅜-inch OD stainless steel reactor vessel in a temperature controlled furnace. After reducing the catalyst under flowing molecular hydrogen, a feed stream of aliphatic hydrocarbons and molecular hydrogen was introduced to the reactor vessel at a pressure of 100 psig, a H2:hydrocarbon molar ratio of 1.3, and a liq...

examples 1-5

[0096]A standard bound KL-zeolite consisting of approximately 17 wt. % silica binder was used as the starting material for Examples 1-5. The bound zeolite base was washed either with water (Example 1) or with water containing 0.1 M of an alkali metal salt (NaCl, KCl, RbCl, or CsCl—Examples 2-5). The washing conditions consisted of 3 wash cycles, each conducted at 100° F. for 20 minutes with the weight of the wash water (with or without alkali metal) being 2.5 times the weight of the bound zeolite base. The washing was performed batchwise with N2 bubbling to agitate the mixture.

[0097]Table I summarizes the metals analysis of the alkali metal enriched zeolite supports after drying and calcining in air at 250° F. and 900° F., respectively. The alkali metal washing steps with rubidium or cesium (Examples 4-5) significantly reduced the amount of sodium in the support, and resulted in about 0.5 moles of the respective alkali metal (per kg) in the alkali metal enriched zeolite support. Alk...

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Abstract

Methods for producing supported catalysts containing a transition metal and a bound zeolite base are disclosed. These methods employ a step of washing the bound zeolite base in the presence of an alkali metal, prior to impregnating the bound zeolitic support with the transition metal. Alkali metals such as potassium and cesium may be used.

Description

FIELD OF THE INVENTION[0001]The present disclosure concerns methods for producing supported catalysts, and more particularly relates to the production of supported aromatization catalysts containing a transition metal and a bound zeolite base using a washing step in which an alkali metal is present.BACKGROUND OF THE INVENTION[0002]The standard manufacturing process for many supported aromatization catalysts typically involves forming a bound zeolite base from a binder and a zeolite, and the zeolite may be ion-exchanged prior to formation of the bound zeolite base. The bound zeolite generally is washed prior to the addition of a transition metal, such as platinum, and a halogen, thereby forming the supported aromatization catalyst.[0003]It may not be desirable to perform an ion-exchange process after the formation of the bound zeolite base, due in part to the additional cost and complexity that it would add to the overall manufacturing process of the catalyst. However, it may be bene...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01J29/74B01J37/06B01J37/02B01J35/10
CPCB01J29/74B01J37/06B01J35/1038B01J35/1019B01J37/0201B01J23/42B01J23/58B01J29/62B01J37/0207C10G35/095C10G45/70B01J2229/42C10G2400/30B01J27/10B01J27/12B01J27/138B01J37/0213Y02P20/52B01J35/633B01J35/615B01J37/0018B01J37/16C07C5/417B01J2229/20B01J2229/40C07C2529/74B01J35/635B01J23/04B01J27/13C10G35/06B01J37/08B01J37/22B01J37/24B01J37/26B01J37/30B01J2229/64
Inventor SNELL, RYAN W.HAO, XIANGHONG
Owner CHEVRON PHILLIPS CHEMICAL CO LP
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